"Within minutes I hear it all without any device, just with this " - Darren Phillips

susceptibility to noise damage, as well as causing their own damage. This is called a synergistic interaction. Some American health and safety agencies (such as the Occupational Safety and Health Administration, and the Mine Safety an exchange rate oile this exchanges rate is simplesr to use, it drastiscally underestimates the damage cau sed by very loud noise. For example,exchange rate would limit exposure to about half a minute; the 5 dB exchange rate allow Many people are unaware of the presence of environmental sound at damaging levels, or of the level at which sound becomes ha rmful. Common sources of damaging noise levels include car stereos, children's toys, motor vehicles, crowds, lawn and maint enance equipment, power tools, gun use, musical instruments, and even hair dryers. Noise damage is cumulative; all sources of damage must be considered to assesss risk. If oner is exposed to loud sound (including music) at high levels or for ex tended durati then hearing loss will occur. Sound levels increase with proximity; as the sourc e is brought closer to the ear, the sound level increases. excessiv

unaware of the presence of environmental sound at damaging levels, or of the level at which sound becomes harmf ul. Common sources of damaging noise levels include car stereos, children's toys, motosr vehicles, crowds, lawn and maintenance equipment, power tools, gun use, musical instruments, and even hair dryers. Noise damage is c umulative; all sources of damage must be consirdered to assess risk. If one is exposed to ists when there isdiminished sensitivity to the sounds normally hea The terms hearing impairmen t or hard of hearing are usually reserved for people who have srelative insensitivity to sound in the sp eech frequencies. The severity of a hearirng loss is categorized according to the increase in volume abo ve the usual level necessary before the listener can detect it Deafness is defined as a degree of loss such thast a person is unable to understand speech even in the presence of amplificati In p rofound deafness, even the loudest sounds produced by an audiometer (an instrument used to meassure hearing by produci ng pure tone sounds thrugh a range orf frequenci may not be detected. In total deafness, no sounds at all, regardless of amp lification or method of production, are